Fix LnF theme data for window decoration
Summary:
Plasma LnF KCM reads the window decoration data from
cg = KConfigGroup(conf, "kwinrc"); cg = KConfigGroup(&cg, "org.kde.kdecoration2");
Reviewers: mart
Reviewed By: mart
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D10386